Probably the explicit breakdown of this game into chapters makes the structure more obvious to people who would have overlooked it in a game without those explicit markers. Also it sounds like the developers did not intend a person to actually go through all 8 stories in a single playthrough but instead focus on a couple, so they may not have put measures into place to ensure that people who did want to play all 8 in one go had an optimal experience.
I feel like the developers intended us to do something like:
Play Character 1's story, Play Character 2, Play Character 3, Go back to Character 1, Try Character 4, Continue Character 2, Continue Character 3, Try New Character 5, etc.
I think the way people are playing it:
Character, 1, 2, 3, 4, 5, 6, 7, 8... Then Continue 1, 2,3,4 ,5 etc....
Is NOT what they intended.